Every incident can be exported as a certificate: the verdict, what each sensor read, the line the witness read it from, and a SHA-256 of the page body it read. The document carries a digest over all of that, so changing any single value breaks it.
This page re-derives that digest in your browser, with no network calls. A verifier that asked our server whether our own document is valid would prove nothing. The answer would be exactly as trustworthy as the claim it checks.
curl https://doorway-api-4ftn.onrender.com/api/incidents/<incident-id>/certificate
Or open any incident from the control room and use its Certificate link. Then edit a single character in the JSON below and watch it fail.
It proves the document has not been edited since it was issued. It is not a signature, so it does not prove NOTICE issued it. A forger could mint a fresh certificate with a matching digest. That is the honest limit, and it is stated here rather than left for you to find. The claim worth checking is the one about the evidence, not about us.